Field experiments were conducted to study direct and residual effect of P-sources and organic manures on rice. Green leaf manuring increased the yield and nutrient uptake by rice. The increase in grain yield with the addition of GLM + URP @ 60 kg P 2 O 5 ha -1 over URP @ 60 kg P2 O 5 ha-1 were 31 per cent in the fertilized plots and 27.9 per cent in the residual plots. Combined application of GLM and P @ 60 kg P 2 O 5 ha -1 irrespective of the P source increased the nutrient uptake by rice. A drastic reduction of value : cost ratio at higher level of fertilizer P application, irrespective of the P sources was recorded. The additional expenditure on incorporation of poultry manure was the highest which dropped the value : cost ratio considerably
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Madras
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Tamil Nadu Agricultural University
Coimbatore - 641 003
Tamil Nadu, India.
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